Commitments and Contingencies - Additional Information (Detail) (USD $)	0 Months Ended						3 Months Ended			9 Months Ended		12 Months Ended	27 Months Ended
	Jul. 03, 2012	Mar. 16, 2012	Dec. 15, 2011 patent	Dec. 16, 2011 patent	Oct. 12, 2011 patent	Oct. 06, 2011 patent	Mar. 30, 2014	Mar. 31, 2013	Sep. 30, 2012	Mar. 30, 2014	Mar. 31, 2013	Jul. 01, 2012	Mar. 30, 2014	Aug. 03, 2011 patent	May 31, 2011 patent	Oct. 14, 2010 patent	Feb. 23, 2010 patent	Sep. 14, 2009 patent
Contingencies And Commitments [Line Items]
Number of patents involved in the Broadcom infringement lawsuit																		10
Number of additional patents involved in the infringement lawsuit in the first amendment																	1
Number of patents dismissed from case														1	2	3
Remaining number of patents					4	6								6	7
Number of patents settled partially						2
Number of patents for which judgments were issued			2	1		1
Loss contingency					$ 400,000
Sunset period related to '150 and '691 patents		18 months
Sunset period royalty rate		9.00%
Settlement amount per Patent License and Release Agreement	58,000,000						5,000,000			5,000,000
Payment for settlement agreement									58,000,000
Litigation settlement expense												36,800,000
License term for amortization of prepaid license fees												10 years
Unamortized prepaid license fees							14,100,000			14,100,000		21,200,000	14,100,000
Amortization expense for patent prepaid license fees and sunset period royalty							1,000,000	1,000,000		3,000,000	2,900,000
Recorded expenses related to incremental mitigation, product redesign and appeal							5,100,000			8,600,000			20,700,000
Royalty payments recorded to cost of sales							1,000,000			2,800,000			3,800,000
Mitigation, product redesign and appeal related expenses [Member]
Contingencies And Commitments [Line Items]
Estimated incremental litigation-related expenses during fiscal 2014, maximum							1,000,000			1,000,000			1,000,000
Customer royalty reimbursements [Member]
Contingencies And Commitments [Line Items]
Estimated incremental litigation-related expenses during fiscal 2014, maximum							3,000,000			3,000,000			3,000,000
Estimated incremental litigation-related expenses in future periods							5,000,000			5,000,000			5,000,000
Estimated incremental litigation-related expenses during fiscal 2014, minimum							1,000,000			1,000,000			1,000,000
Prepaid expenses and other current assets [Member]
Contingencies And Commitments [Line Items]
Unamortized prepaid license fees							3,900,000			3,900,000			3,900,000
Other assets [Member]
Contingencies And Commitments [Line Items]
Unamortized prepaid license fees							$ 10,200,000			$ 10,200,000			$ 10,200,000